It is a partial differential equation satisfied by the electric field e.
这是一个，由电场e确定的偏微分方程。
Parameter identification problems belong to the partial differential equations inverse problems. They are also common in the field of natural science and engineering.
参数识别反问题是偏微分方程反问题的一类，也是在自然科学与工程技术的各领域比较常见的问题。
The research on multi-dimensional conservation laws is one of the most challenging direction in the field of nonlinear partial differential equation, it is very important and very difficult.
高维守恒律方程的研究是非线性偏微分方程的最具有挑战性的方向之一。
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